Fuel

Question 1

How many AC powered pumps are there for each tank?

Answer 1

Two for each

Question 2

When does the fuel low indication appear on the sctratchpad?

Answer 2

When the fuel quantity is less than 2000 lbs in the related main tank

Question 3

When does the fuel CONFIG indication appear?

Answer 3

• Either engine is running
• Both center tank fuel pump switches are off
• Center tank quantity is greater than 1,600 lbs

Question 4

How long do the indications remain on?

Answer 4

• Both engines aren’t running
• One center tank pump switch is on
• Center tank quantity is less than 800 lbs

Question 5

When will the INSUFFICIENT FUEL alert message display?

Answer 5

It displays when a change in conditions or a change to the flight plan results in the predicted fuel at destination being 2,000 lbs or less

Question 6

The FILTER BYPASS lights indicate the state of the filters, and are normally extinguished. When do they illuminate?

Answer 6

When there is an impending fuel filter bypass due to a contaminated filter

Question 7

Center tank pumps will illuminate a LOW PRESSURE light when what happens?

Answer 7

They only illuminate when the pump is on, and a low pressure condition exists

Question 8

What limitations apply when loading fuel into the center tank?

Answer 8

Main tanks must be full if center tank quantity is greater than 1,000 lbs

1,000 lbs may be retained as long as effects of balance have been considered

Question 9

How is the cross feed valve operated?

Answer 9

DC motor operated from the battery bus

Question 10

Which tank supplies fuel to the APU?

Answer 10

No. 1 tank

Question 11

When does the scavenge jet pump in the center tank automatically activate?

Answer 11

When main tank fuel is less than half full
Requires fuel pump on in the respective tank

Question 12

The nitrogen generation system (ngs) is installed for what purpose?

Answer 12

To convert engine bleed air to nitrogen-enriched air.
It inserts gases to replace ambient air in the center fuel tank reducing chances of in-tank combustions

Question 13

The NGS is completely automatic, when will the NGS shutdown?

Answer 13

• The aircraft is on the ground and the NGS isn’t in test mode
• Either engine is not running in flight
• Fire or smoke detected in the cargo or main deck areas
• Left air conditioning pack overheat
• Center tank refueling valve is open

Question 14

How is the fueling station powered?

Answer 14

AC power is available or batteries are on.
Can also be powered by DC power from hot battery Bus using the fuel door switch bypass.

Question 15

How many fuel measuring sticks are installed in each wing and center tank?

Answer 15

6 in each wing
4 in center

Question 16

With both engines running with 2,000 lbs fuel in center tank. Cent tank fuel pump switches off. What indication will you see?

Answer 16

A CONFIG message on the center tank fuel quantity indication